when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>({
  1. required TResult formData(
    1. Map<String, String>? headers
    ),
  2. required TResult basic(
    1. Map<String, String>? headers
    ),
  3. required TResult data(
    1. Map<String, String>? headers
    ),
})

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs TResult when<TResult extends Object?>({required TResult Function( Map<String, String>? headers)  formData,required TResult Function( Map<String, String>? headers)  basic,required TResult Function( Map<String, String>? headers)  data,}) {final _that = this;
switch (_that) {
case _FormData():
return formData(_that.headers);case _Basic():
return basic(_that.headers);case _Data():
return data(_that.headers);}
}